use passed args, or sys.argv by default
use passed args, or sys.argv by default

datafolklabs/cement,fxstein/cement,rjdp/cement,rjdp/cement,akhilman/cement,fxstein/cement,rjdp/cement,datafolklabs/cement,fxstein/cement,akhilman/cement,datafolklabs/cement,akhilman/cement